Wieland bur, VHF zirconia bur, manual operation bur, ZZZ bur Wieland bur, VHF zirconia bur, manual operation bur, ZZZ bur The photos and introductions belong to ... R, hollow, oblique flute (tapered), long flute, for aluminum, copper application, chip-dividing groove (for rough mill application) ... as to realize high efficiency application. Wieland bur, VHF zirconia bur, manual operation bur, ZZZ bur